Never would I expect a "surgery" refers to a room, given the fact that the only expression in the sheet which explicitly talked about rooms is "treatment rooms", and it appears way before "surgery". I thought there should be some consistency when we are using terms. Oh, and you have said we can "for example, assume surgery is a special service, it makes sense" during a workshop, which makes things worse. Thank you for clarifying everything here finally, but many students have already been working on their projects, and some may have even completed most of their work since the deadline is approaching. It would surely be disappointing for them to discover that they have misunderstood the instructions...